Adapting audio signals to a change in device orientation

• US 8,965,014 B2
• Filed: 08/19/2011
• Issued: 02/24/2015
• Est. Priority Date: 08/31/2010
• Status: Active Grant

• Current Assignee: Monterey Research, LLC (Vector Capital Corporation)
• Original Assignee: Cypress Semiconductor Corporation (Infineon Technologies AG)
• Inventors: Castor-Perry, Kendall
• Primary Examiner(s): Saunders, Jr., Joseph
• Assistant Examiner(s): MOONEY, JAMES K
• Application Number:
  US13/213,430
• Publication Number:
  US 20120051567A1
• Time in Patent Office: 1,285 Days
• Field of Search: 381/84, 381/304
• US Class Current: 381/304
• CPC Class Codes: H04R 2201/028 Structural combinations of loudspeakers with built-in power amplifiers, e.g. in the same acoustic enclosure H04R2499/10 takes precedence; Single (sub)woofer with two or more satellite loudspeakers for mid- and high-frequency band reproduction driven via the (sub)woofer H04R2205/026
• CPC Class Codes: H04R 2205/022 Plurality of transducers corresponding to a plurality of sound channels in each earpiece of headphones or in a single enclosure
• CPC Class Codes: H04R 2420/03 Connection circuits to selectively connect loudspeakers or headphones to amplifiers
• CPC Class Codes: H04R 2499/11 Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
• CPC Class Codes: H04R 29/002 Loudspeaker arrays
• CPC Class Codes: H04S 2400/07 Generation or adaptation of the Low Frequency Effect [LFE] channel, e.g. distribution or signal processing
• CPC Class Codes: H04S 2400/13 Aspects of volume control, not necessarily automatic, in stereophonic sound systems
• CPC Class Codes: H04S 7/30 Control circuits for electronic adaptation of the sound field

Abstract

Left and right stereo channels L and R are provided to a first set of two or more speakers of a speaker array. A bass signal B is applied to a second set of one or more speakers of the speaker array. The level of L and R applied to the first set of speakers is increased as the first set of speakers is rotated to become more horizontally aligned. The level of B applied to the first set of speakers is decreased as the first set of speakers is rotated to become more horizontally aligned.

Claims

1. A device comprising:

a speaker array comprising three or more speakers configured to produce stereo sound based on left and right stereo signal channels L and R, respectively;

logic to derive a low frequency bass signal, B from L and R;

logic to increase a level of signal B and decrease a level of L or R output by a first speaker of the speaker array as the first speaker is rotated through 90 degrees by way of a rotation of the device between a first and second orientations, and to increase a level of L or R and decrease a level of B output by at least a second speaker of the speaker array throughout the rotation.

2. The device of claim 1, further comprising:

logic to apply the signal B to every speaker of the array regardless of the orientation of the device.

3. The device of claim 1, comprising exactly three speakers driven by four amplifiers.

4. The device of claim 3, configured with logic that in portrait and landscape orientations provides one of the three speakers with a signal R+B, another of the three speakers with a signal L+B, and yet another of the three speakers with a signal 2B.

5. The device of claim 3, configured so that in either a portrait or landscape orientations, one of the three speakers receives a signal R, another of the three speakers receives L, and yet another of the three speakers receives B.

6. The device of claim 3, comprising logic to apply a continuous adjustment of the output of one of the speakers from B to R or from B to L as the device is rotated between the first and second orientations.

7. The device of claim 3, comprising exactly four amplifiers and exactly three speakers, wherein two of the four amplifiers are coupled to exactly two speakers apiece, and a different two of the four amplifiers are coupled to exactly one speaker apiece.

8. The device of claim 1, comprising logic to apply a continuous adjustment from R to L of the output of one of the speakers as the device is rotated between the first and second orientations.

9. The device of claim 1, the device being a visual display coupled to the speaker array via a docking platform, configured so that the display rotates and the speaker array remains in a fixed orientation and the horizontal alignment of various speakers in the array is a virtual property determined from the rotational angle of the visual display.

10. The device of claim 1, wherein all speakers of the speaker array are full range speakers.

11. An audio circuit, comprising:

stereo left and right channel inputs L and R, respectively;

at least three amplifier outputs; and

logic to adjust one or more of the amplifier outputs from primarily full range outputs to primarily bass outputs and vice versa according to a parameter representing a degree of rotation of at least three speakers.

12. The circuit of claim 11, further comprising logic to adjust the amplifier outputs as a function of a degree of horizontal alignment associated with the at least three speakers.

13. The circuit of claim 11, comprising exactly four amplifiers configured to provide output signals to exactly three speakers.

14. The circuit of claim 11, further comprising logic to adjust the parameter representing the degree of rotation according to an elapsed time from when a beginning of rotation of the at least three speakers is first detected.

15. A process comprising:

providing left and right stereo channels L and R, respectively to a first set of two or more speakers of a speaker array, the speaker array configured to provide stereo sound using L and R;

applying a bass signal B to a second set of one or more speakers of the speaker array; and

continuously decreasing the level of L or R applied to at least one speaker of the first set of speakers as the first set of speakers is rotated through 90 degrees; and

continuously increasing the level of B applied to the at least one speaker of the first set of speakers as the first set of speakers is rotated through the 90 degrees.

16. The process of claim 15, further comprising:

continuously decreasing the level of B applied to at least one of the second set of speakers as the second set of speakers is rotated through the 90 degrees.

17. The process of claim 15, further comprising:

the total number of speakers in the array is three.

18. The process of claim 15, further comprising:

adjusting the application of L, R, and B to the first set and the second set as the speaker array is rotated so that in both of a portrait and landscape orientations, a first speaker of the speaker array receives L+B, a second speaker of the speaker array receives R+B, and a third speaker of the speaker array receives 2B.

19. The process of claim 15, further comprising:

adjusting the application of L, R, and B to the first set and the second set as the speaker array is rotated so that in both of a portrait and landscape orientations, a first speaker of the speaker array receives L, a second speaker of the speaker array receives R, and a third speaker of the speaker array receives B.

20. The process of claim 15, further comprising determining the amount of L, R, and B to apply in a digital oversampled domain.

21. The process of claim 15, further comprising:

determining the amount of L, R, and B to apply to particular speakers according to an angle of rotation of a visual display device coupled to the speaker array.